E (disambiguation)

User interfaces

• E or Enlightenment (software), a free software open source manager for X Window System
• /e/ (operating system), a fork of LineageOS, which in turn is based on Android
• E (1970s text editor), a text editor developed at the Stanford AI Lab in the 1970s
• E (PC DOS), a text editor

Languages and provers

• E (programming language), an object-oriented programming language
• Amiga E, a programming language
• e (verification language) hardware verification language
• E (theorem prover), a modern, high performance prover for first-order logic

Logic and abstract mathematics

• E (complexity), a set of decision problems solvable by a Turing machine in a specific time
• ∃ (a backwards E; U+2203) or existential quantification, the symbol for "there exists...", in predicate logic
  • ∃!, meaning "there exists only one" (or "there exists exactly one"), the uniqueness quantification
• e, the identity element
• ∈, notation indicating that an object is a member or element of a set: see Element (mathematics)

Concrete mathematics

• E, 14 in hexadecimal and other positional numeral systems of a base of 15 or higher
• E notation, or scientific notation, a way of writing very large and very small numbers such as 5E7
• E ⁡ [ X ] {\displaystyle \operatorname {E} [X]} or expected value, the average expected outcome of a trial in probability theory
• E, the complete elliptic integral of the second kind
• E, the Erdős–Borwein constant
• e (mathematical constant), a mathematical constant also known as Euler's number and Napier's constant
• e or orbital eccentricity, a measure of how much a conic section deviates from a circle

Medicine

• E number, a number code for a food additive, an EU labelling requirement
• Haplogroup E (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup
• Haplogroup E (Y-DNA), a Y-chromosomal DNA (Y-DNA) haplogroup
• E (or Glu), an abbreviation for glutamic acid or glutamate
• Vitamin E or tocopherol, a class of chemical compounds
• The symbol for the hormone epinephrine
• E, a common abbreviation for 'Ecstasy' (a familiar name for the psychoactive recreational drug MDMA)
• Ethambutol
• Estrogen (medication)
• Estradiol (medication)

Electricity

• e, one of two fundamental subatomic particles:
  • e⁻
    , electron
  • e⁺
    , positron
• e or elementary charge, the absolute value of the electric charge carried by a single electron
• E region (between D and F) or the Kennelly–Heaviside layer, part of the ionosphere
• E, the symbol for an electric field
• E, the electrode potential, the electromotive force of a cell built of two electrodes
  • E° or E ⊖ {\displaystyle E^{\ominus }} , the standard electrode potential

Telecommunication

• E band (disambiguation)
• E or EDGE, for Enhanced Data Rates for GSM Evolution

Trains/rail

• E, a Polish electric locomotive in the list of rolling stock used in Poland
• E (Los Angeles Railway)
• E (New York City Subway service), a subway service in New York
• E Line (Los Angeles Metro)
• Line E (Buenos Aires Underground) of the Buenos Aires Subte
• RER E, a line in the RER of Paris
• Toei Ōedo Line, a subway service operated by the Tokyo Metropolitan Bureau of Transportation (Toei), labeled
• The official West Japan Railway Company service symbol for:
  • San'in Main Line
  • Kisuki Line

Cars/automotive

• E-Mark, an approval mark for automotive products in Europe under the World Forum for Harmonization of Vehicle Regulations
• Mini E, an electric hatchback built as a demonstration car
• Honda e, an electric hatchback

Car license plates

• E, the international vehicle registration code for vehicle registration plates of Spain
• E, the prefix in vehicle registration plates of Indonesia for Cirebon, Majalengka, Indramayu and Kuningan

Political

• Chinese: 鄂
  • E (state), a vassal state in Zhou Dynasty China (1046–256 BC)
  • Hubei, abbreviated in Chinese as È, a province of China
• E Township, Maine, an unincorporated community in USA

• E postcode area, for east London
• E, New Brunswick's postal code

Geographical

• E or east, one of the four cardinal directions
• Mount E (Japanese: 恵山, romanized: E-san, lit. 'Mount Wisdom'), a stratovolcano on Oshima Peninsula, Japan
• River E, a river in Scotland

Similar-looking letters

• Ɛ/ɛ, the letter epsilon in the Latin alphabet
• Ε/ε/ϵ, the letter epsilon in the Greek alphabet
• ⴹ, the letter yaḍ in the Tifinagh alphabet
• Е/е, the letter ye in the Cyrillic alphabet
• ㅌ, the hangul tieut in the Korean alphabet
• ꗋ, the syllable tɔ in the Vai syllabary
• Ꭼ/ꭼ, the syllable gv/kə̃ in the Cherokee syllabary
• ᰀ, the consonant ka in the Lepcha script
• ꯐ, the letter pham in the Meitei script
• 𐐁/𐐩, the letter long E in the Deseret alphabet
• 𖼬, the consonant nya in the Pollard script
• ᗴ, the syllable cha in a Chipewyan script in the Canadian Aboriginal syllabics family
• عـ/ـعـ/ـع/ع, the letter 'ayn in the Arabic alphabet
• ٤, the digit four in the Eastern Arabic numerals
• 𐎅, the letter h in the Ugaritic alphabet
• Ҽ, the letter che in the Cyrillic script alphabet of the Abkhaz language

Music

Television

• E, short for "episode"; commonly combined with "S" for season
• E!, Entertainment Television, an American cable and satellite TV network
  • E! (Australia and New Zealand), the defunct Australian and New Zealand version of American E!
• E! (Canada):
  • E! (Canadian TV system), a defunct over-the-air television system operated by Canwest from 2001 to 2009 (originally known as CH until 2007)
  • E! (Canadian TV channel), a Canadian cable/satellite specialty channel owned by Bell Media that launched in November 2010
• E, an alias of Eric Murphy (Entourage), a character from the television series Entourage
• E, the production code for the 1964 Doctor Who serial The Keys of Marinus

Film

• E (Exempt), an unofficial category in the British Board of Film Classification rating system
• E, an alias of Edna Mode, a character from the movie The Incredibles
• E (2006 film), a 2006 Tamil film
• E (2017 film)
• E (2025 film), a Finnish experimental drama film

Literature

• e (novel), a 2000 comic novel by Matt Beaumont
• E, or the Elohist, one of the four sources of the Torah

Gaming

• E, or Everyone, a video game rating symbol used by the Entertainment Software Rating Board which is suitable for all ages
• e, a nickname of Eric Neustadter, Former Operations Manager for Xbox Live and frequent co-host of the "Major Nelson Radio" podcast